DECODING METHOD - VICTOR COMPANY OF JAPAN

Title:

DECODING METHOD

Document Type and Number:

Japanese Patent JP2002358009

Kind Code:

A

Abstract:

To enable a listener to listen to the content of 'copy prohibition' only once when the listener wants to listen, and to enable copying the content of 'copiable only once' on a medium and then copy on another medium and edit it only once and also to ensure security of data at this time.

In the decoding method, information composed of succession of a plurality of unit blocks encrypted for each unit block is decoded. The seed of an encryption key to decode the prescribed unit block is the information based on the encryption key used when encrypting the unit block other than the prescribed unit block.

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Inventors:

UEDA KENJIRO
SUGAWARA TAKAYUKI
IBA WATARU
HIGURE SEIJI
KUROIWA TOSHIO

Application Number:

JP2001311116A

Publication Date:

December 13, 2002

Filing Date:

October 09, 2001

Export Citation:

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Assignee:

VICTOR COMPANY OF JAPAN

International Classes:

H04N5/765; G06F21/10; G09C1/00; G11B20/10; G11B20/12; H04L9/08; H04N5/781; H04N5/782; H04N5/7826; H04N5/91; H04N5/92; H04N7/16; H04N7/167; H04N21/433; H04N21/4405; H04N21/4623; (IPC1-7): G09C1/00; G11B20/10; G11B20/12; H04L9/08; H04N5/765; H04N5/781; H04N5/7826; H04N5/91; H04N5/92; H04N7/16; H04N7/167

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